In order to explore the water control mechanism of buried hill crack reservoir section, taking Huizhou 26?6 condensate field as an example,the fracture gas reservoir water control physical experiment model,equilibrium gas water interface and piecewise water control experiment evaluation were established,through designing the experimental parameters,buried hill crack formation and water control process.The results show that the segmented water control can effectively prolong the water?free gas production period and delay the water breakthrough time to a certain extent.The different combination of crack and horizontal well section would induce diverse gas production characteristics.Coupling between horizontal well subsection water control and gas reservoir seepage was a complex process.The matching between blind pipe section and production section directly affects the gas well productivity.The opening degree of production section,the length and the location of blind pipe section are the main factors affecting the productivity of fractured gas reservoir.The research results will establish a sublevel water control development model for buried hill gas reservoirs and provide good technical support for rational and scientific research on water control of horizontal wells in offshore condensate gas fields.

Through the analysis of stress sensitivity data of low permeability rock samples in the periphery of Daqing, it is found that the stress sensitivity of low permeability oil layer is greatly affected by permeability and effective stress, and the power relation can be used to better fit the relationship between permeability and effective pressure. According to the experimental analysis, the relationship between permeability and bottomhole pressure, oil well production and bottomhole pressure under the influence of stress sensitivity is derived, and the corresponding stress sensitivity map of low permeability reservoir in Daqing is drawn. Through numerical simulation, the effect of advanced water injection technology on the development of low permeability reservoirs was studied and relevant technical indicators were optimized.